The City of Roseville’s groundwater management program is designed to diversify our water supplies by adding ground water as an additional source to existing surface water supplies; the majority of which comes from lake Folsom.
During times of year, and years that have an excess amount of surface water, we will be able to inject that excess water down into the underground aquifer at the well sites. During times of year, and years where there is a shortage of surface water; such as a drought, we will be able to pump water out of the aquifer at the well sites to meet water demands of the City.
Traffic: During the construction period expect additional traffic around the site as workers arrive, when materials are delivered, and as facilities are constructed and installed.
Noise: Significant noise is expected only during drilling of the wells. Depending on the depth of the well, drilling can take up to two weeks. For the Solaire (well 18) and Westbrook (well 9) the wells were drilled several years ago as part of the development agreement.
Moderate construction noise can be expected between 7 a.m. and 7 p.m. on weekdays. This will include earth moving equipment, concrete placement, and general construction activities.
Safety: Sidewalks will be closed around the construction site and marked with signs. Traffic control plans are prepared and submitted by the construction contractor. These plans are reviewed by the City’s Public Works – Traffic Engineering department for approval before implementation.
Construction sites will have temporary fencing installed to safeguard the public from hazardous conditions when construction workers are not present and to protect stockpiles of materials and equipment.
Recently, construction sites have been the target of theft around the City. Therefore monitoring cameras have been installed at the sites to protect the contractor’s equipment and supplies.
The City anticipates pumping activities generally to occur during the summer months with additional pumping for short durations year-round to maintain the wells. It is also anticipated that recharge (injection of water into the aquifer) will occur during winter months.
Wells will be operated in either production mode (pumping out of the wells), recharge mode (injection of water into the aquifer through the wells), or on a maintenance schedule depending on the needs of the facility, current water demand, and available water resources.
Water production (pumping of the wells) to supplement surface water supplies could occur 24-hours per day if needed.
Water injection (recharging of the aquifer) could also occur 24-hours per day if excess surface water is available.
Maintenance of the well facility will require periodic flushing of the wells and backwashing of the filters. These activities will occur for short durations of time on an appropriate schedule at each site. We expect that flushing of the wells will occur during daytime work hours. Backwashing of the filters is programmed to occur automatically based on hours of water production and if filters exhibit the need. Discharges from these flushing and backwashing activities will be contained by either the onsite storm drain or sanitary sewer systems.
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We conducted an environmental noise assessment for the Solaire and Westbrook well sites to ensure that the projects would not exceed the City of Roseville’s noise level standards at the adjacent sensitive receptors.
Filter tanks: The acoustics study included a visit to another City where the same filter vessels were in use. It was found that there was no audible noise coming from the filtration tanks when in normal operation. When the tanks are backwashed water will be discharged through an air gap to the flow equalization tank and trickled into the sanitary sewer system. Other than the sound of running water during backwash, no sound is expected from the filters.
Well Pumps: The well pumps could be a significant source of ambient noise. To mitigate sound travelling out of the site, the designs included multiple strategies and types of equipment as recommended in the noise assessment. The building is constructed of 12-inch filled concrete masonry units. The roof system includes sound absorbing materials. The overhead coiling door assemblies and man-doors are acoustically insulated. Ventilation louvers with low sound transmission were selected.
Air Conditioning: Air conditioning is required in each of the pump buildings for the electrical equipment. Location of the exterior compressor component of the air conditioning system was determined by the sound study to direct sounds away from residents. A Variable Refrigerant Flow (VRF) system was installed to reduce ambient noise both inside the building as well as outside in comparison to traditional HVAC technology.
Each well site is designed with security measures including motion-activated cameras, yard lighting, no-climb gates, and interior and exterior signs with emergency contact phone numbers.
Water distribution system operators will visit the well facilities several times each week for operational checks, water sampling, and periodic maintenance. Deliveries of supplies may occur a couple of times per month.
At both the Solaire and Westbrook sites, trees and shrubs have been selected to block views, provide ornamental benefits, and increase sound buffers.
At Solaire it is planned to plant a row of Italian cypress trees inside the well site’s perimeter wall running north-south along the west wall. Outside of the perimeter wall there will be a row of small ornamental trees running north-south on the east side of the site. On the north side of the site there will be smaller shrubs and ground cover planted to match existing plantings around the park.
At Westbrook there will be a row of tall shrubs planted inside of the well site’s perimeter on the west side. Outside of the perimeter walls the plants will be replaced to match previous landscape design that was installed by the subdivision’s developer.
Landscape plants and irrigation will be maintained by a dedicated contract to the City’s Environmental Utilities.